import store from '@/store'
import config from '@/config'
import {
	getToken
} from '@/utils/auth'
import errorCode from '@/utils/errorCode'
import {
	toast,
	showConfirm,
	tansParams
} from '@/utils/common'

let timeout = 10 * 60 * 1000 // 请求超时时间
const baseUrl = config.baseUrl

function removeEmptyField(obj) {
	var newObj = {}
	if (typeof obj === 'string') {
		obj = JSON.parse(obj)
	}
	if (obj instanceof Array) {
		newObj = []
	}
	if (obj instanceof Object) {
		for (var attr in obj) {
			// 属性值不为'',null,undefined才加入新对象里面(去掉'',null,undefined)
			if (obj.hasOwnProperty(attr) && obj[attr] !== '' && obj[attr] !== null && obj[attr] !== undefined) {
				if (obj[attr] instanceof Object) {
					// 空数组或空对象不加入新对象(去掉[],{})
					if (JSON.stringify(obj[attr]) === '{}' || JSON.stringify(obj[attr]) === '[]') {
						continue
					}
					// 属性值为对象,则递归执行去除方法
					newObj[attr] = removeEmptyField(obj[attr])
				} else if (
					typeof obj[attr] === 'string' &&
					((obj[attr].indexOf('{') > -1 && obj[attr].indexOf('}') > -1) ||
						(obj[attr].indexOf('[') > -1 && obj[attr].indexOf(']') > -1))
				) {
					// 属性值为JSON时
					try {
						var attrObj = JSON.parse(obj[attr])
						if (attrObj instanceof Object) {
							newObj[attr] = removeEmptyField(attrObj)
						}
					} catch (e) {
						newObj[attr] = obj[attr]
					}
				} else {
					newObj[attr] = obj[attr]
				}
			}
		}
	}
	return newObj
}

let lock401 = true

const request = config => {
	// 是否需要设置 token
	const isToken = (config.headers || {}).isToken === false
	config.header = config.header || {}
	if (getToken() && !isToken) {
		config.header['Authorization'] = 'Bearer ' + getToken()
	}
	// get请求映射params参数
	if (config.params) {
		let url = config.url + '?' + tansParams(config.params)
		url = url.slice(0, -1)
		config.url = url
	}

	if (config.data) {
		if (typeof(config.data) !== 'string') {
			config.data = removeEmptyField(config.data)
		}
	}
	return new Promise((resolve, reject) => {
		uni.request({
				method: config.method || 'get',
				timeout: config.timeout || timeout,
				url: config.baseUrl || baseUrl + config.url,
				data: config.data || config.params || {},
				header: config.header,
				dataType: 'json'
			}).then(response => {
				let [error, res] = response
				if (error) {
					toast('后端接口连接异常')
					reject('后端接口连接异常')
					return
				}
				const code = res.data.code || 200
				const msg = errorCode[code] || res.data.msg || errorCode['default']
				if (code === 401) {
					showConfirm('登录状态已过期，您可以继续留在该页面，或者重新登录?').then(res => {
						if (res.confirm) {
							if (lock401) {
								lock401 = false
								setTimeout(() => {
									lock401 = true
								}, 1000)
								store.dispatch('LogOut').then(res => {
									uni.reLaunch({
										url: '/pages/login'
									})
								})
							}
						}
					})
					reject('无效的会话，或者会话已过期，请重新登录。')
				} else if (code === 500) {
					toast(msg)
					reject('500')
				} else if (code !== 200) {
					toast(msg)
					reject(code)
				}
				resolve(res.data)
			})
			.catch(error => {
				let {
					message
				} = error
				if (message === 'Network Error') {
					message = '后端接口连接异常'
				} else if (message.includes('timeout')) {
					message = '系统接口请求超时'
				} else if (message.includes('Request failed with status code')) {
					message = '系统接口' + message.substr(message.length - 3) + '异常'
				}
				toast(message)
				reject(error)
			})
	})
}

export default request